[Idea] Depth selection for depth effects

#include "ReShade.fxh"

#define TEXFORMAT R8

uniform float fMask_Intensity <
    ui_label = "Mask Intensity";
    ui_type = "drag";
    ui_min = 0.0;
    ui_max = 1.0;
    ui_step = 0.001;
> = 1.0;

uniform float DepthMaskCut <
    ui_type = "drag";
    ui_min = 0.0;
    ui_max = 1.0;
    ui_step = 0.001;
> = 1.0;


uniform bool bDisplayMask <
    ui_label = "Display Mask";
> = false;

uniform float MaskExposure <
    ui_type = "drag";
    ui_min = -1.0; ui_max = 1.0;
> = 0.0;


uniform bool MaskReverse = false;

texture tDepthMask { Width = BUFFER_WIDTH; Height = BUFFER_HEIGHT; };
sampler sDepthMask { Texture = tDepthMask; };

float4 PS_Backup(float4 pos : SV_Position, float2 uv : TEXCOORD) : SV_Target {
    return tex2D(ReShade::BackBuffer, uv);
}

float4 PS_ApplyMask(float4 pos : SV_Position, float2 uv : TEXCOORD) : SV_Target {
    float3 col = tex2D(ReShade::BackBuffer, uv).rgb;
    float3 bak = tex2D(sDepthMask, uv).rgb;
    
    float mask;
    if ( MaskReverse == 1 )
        mask = (1-ReShade::GetLinearizedDepth(uv).r);
    else
        mask = ReShade::GetLinearizedDepth(uv).r;

    if (mask > DepthMaskCut )
        mask == 1;

    mask *= pow(2.0f, MaskExposure); // Exposure

    mask = lerp(1.0, mask, fMask_Intensity);
    col = lerp(bak, col, mask);
    col = bDisplayMask ? mask : col;
    
    return float4(col, 1.0);
}

technique DepthMask_Top {
    pass {
        VertexShader = PostProcessVS;
        PixelShader = PS_Backup;
        RenderTarget = tDepthMask;
    }
}

technique DepthMask_Bottom {
    pass {
        VertexShader = PostProcessVS;
        PixelShader = PS_ApplyMask;
    }
}